1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2506e7e091119f1aeb742926eb29addc39e66af51b40c888a96a9037e1ee6d6b. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/57f43b7b-7b25-4ac0-9cd3-6a754b84d90e.json and https://artists.proofprofile.net/proofs/artist/57f43b7b-7b25-4ac0-9cd3-6a754b84d90e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9af514f72ee8ccf2a370c900b3621a3cf6af8c7e6f0c6e797867509fa5cee7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYX2347524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ccc69ca4302a64ad5b9e9027c6c0065cef18cba104eb067b5f9db938f7acdde. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52117415.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9170c0c48daf86af31a1b851f7a3cb88c56a97c2fd43da2e51a1e0328202b9cf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4R2311354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a37e79490807a6edcd5b9ec438f0c81c6475b5ab39d1af8d32b4d4745cf2b6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USMH92306735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3732ae327c917c7320b3763005d70bf4efad8530ec46c6213ceeb1a7140605. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:39:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB82257774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d7d45f8ce2742ee82fc94bddc42bd3ef3ae9306d1814d412f61491eecc7f92. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2291245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3776233156b11db4058695e37455484ffa96f64057ae977b6262c1f1e66da7ed. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ42446582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff14c8e209e3cffb71f9226e6915b6f54fda6adc7282f8b14766e3288fe0e51. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY2324989.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70411753abbbfbc4a362aead17211d0c8104e1928dd1f6628b841c4a6929ff3a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNC2205663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f6a8c39cabb3e8d6cdf4b1f9c8b6cbc733d8ab4d67d21f0ffe16ca13069264. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTRX2225634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9466df3aa591feb46fd1d750db4e0093d6f612f92c2b72052c41139f3049bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNA2273207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72760e8a41164c873d713564003e1a29dc313fc582b0c5ff756e0eaae9df5cfd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6M2185113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a0d698ce834bd7e996c014eba6fe18af93026c657cd381b9a848762e2b1e77. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES62310863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e49a769fb39e82e77e15ba901e3407da40bb0b0fd5d4b8b3e9f2437ca39437. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2166857.